Evaluate
\frac{7}{1000000000000000000000}=7 \cdot 10^{-21}
Factor
\frac{7}{2 ^ {21} \cdot 5 ^ {21}} = 7.000000000000001 \times 10^{-21}
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7\times \frac{1}{1000000000000000000000}
Calculate 10 to the power of -21 and get \frac{1}{1000000000000000000000}.
\frac{7}{1000000000000000000000}
Multiply 7 and \frac{1}{1000000000000000000000} to get \frac{7}{1000000000000000000000}.
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